The first 4-pole motor with a built-in chip which helps ESC identify it's a HOBBYWING motor (only when pairing it with the XeRun XR8 series of ESCs) and the XR8 ESC create a power system which is able to work in the ""sensored"" mode (at all times) and provide users with the better performance and smoother control. Note: this motor is compatible with other ESCs but unable to work in the ""sensored"" mode at all times. The Turbo Timing which is widely used (by 2-pole motors) in 1/10 scale on-road racing can be enabled to unleash the utmost power of the motor when pairing the XeRun 3652/3660 G2 with the XeRun XR8 series of ESCs. The HOBBYWING-patented ""error-free"" Hall sensing system adopted by the motor guarantees users the steady operation in the “sensored” mode. A separate high-speed high precision encoder always outputs the clean signals (indicate the position of the rotor) and protects the Hall sensing system from other signal interference. The HOBBYWING-patented 4-pole-8-magnet ""staggered pole"" rotor with the extremely low cogging effect and torque pulsation greatly improves the driving feel around corners. The use of double insulated windings (200? R-leveled), Japanese NMB bearings, super thin silicon steel sheets and the high-intensity adhesive (300?) guarantees users the outstanding performance and great durability. (With the strength of the motor is guaranteed,) the wheel hub design adopted by front & rear end bells effectively reduces the motor weight. HobbyWing XeRun 3660 SD G2 Features: Full-sensored Mode Turbo Timing Technology Bi-directional Adjustable Timing Advanced Hall Sensing System Low Cogging Torque Quality Materials & Excellent Design Turbine Design Compatible with the XeRun XR8 SCT ESC Spec Check: Scale: 1/10th Brushed/Brushless: Brushless Sensored/Sensorless: Sensored Pole Count: 4 KV Rating: 3200 LiPo Cells: 2-3S No-load Current(A): 3.7 Resistance(m?): 6.5 O.D.(mm): 36mm (1.417in) Length(mm): 62 (2.44in) Shaft Diameter(mm): 5 (0.197in) Weight(g): 218 Shaft Length(mm): 17 (0.669in) Timing: 20-40 Degrees (Adjustable) (HW30401150)